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import requests
from .workers import SandcrawlerWorker
from .misc import gen_file_metadata, requests_retry_session
from .ia import WaybackClient, WaybackError, PetaboxError
class PdfTrioClient(object):
def __init__(self, host_url="http://pdftrio.qa.fatcat.wiki", **kwargs):
self.host_url = host_url
self.http_session = requests_retry_session(retries=3, backoff_factor=3)
def classify_pdf(self, blob):
"""
Returns a dict with at least:
- status_code (int, always set)
- status (success, or error-*)
On success, the other remote API JSON response keys are also included.
On HTTP-level failures, the status_code and status field are set
appropriately; an optional `error_msg` may also be set. For some other
errors, like connection failure, an exception is raised.
"""
assert blob
try:
pdftrio_response = requests.post(
self.host_url + "/classify/pdf/all",
files={
'pdf': blob,
},
timeout=30.0,
)
except requests.Timeout:
return {
'status': 'error-timeout',
'status_code': -4, # heritrix3 "HTTP timeout" code
'error_msg': 'pdftrio request (HTTP POST) timeout',
}
info = dict(
status_code=pdftrio_response.status_code,
)
if pdftrio_response.status_code == 200:
resp_json = pdftrio_response.json()
assert 'ensemble_score' in resp_json
assert 'status' in resp_json
assert 'versions' in resp_json
info.update(resp_json)
else:
info['status'] = 'error'
# TODO: might return JSON with some info?
# add this timing info at end so it isn't clobbered by an update()
if not info.get('timing'):
info['timing'] = dict()
info['timing']['total_sec'] = pdftrio_response.elapsed.total_seconds(),
return info
class PdfTrioWorker(SandcrawlerWorker):
"""
This class is basically copied directly from GrobidWorker
"""
def __init__(self, pdftrio_client, wayback_client=None, sink=None, **kwargs):
super().__init__()
self.pdftrio_client = pdftrio_client
self.wayback_client = wayback_client
self.sink = sink
def process(self, record):
default_key = record['sha1hex']
if record.get('warc_path') and record.get('warc_offset'):
# it's a full CDX dict. fetch using WaybackClient
if not self.wayback_client:
raise Exception("wayback client not configured for this PdfTrioWorker")
try:
blob = self.wayback_client.fetch_petabox_body(
csize=record['warc_csize'],
offset=record['warc_offset'],
warc_path=record['warc_path'],
)
except (WaybackError, PetaboxError) as we:
return dict(
status="error-wayback",
error_msg=str(we),
source=record,
key=default_key,
)
elif record.get('url') and record.get('datetime'):
# it's a partial CDX dict or something? fetch using WaybackClient
if not self.wayback_client:
raise Exception("wayback client not configured for this PdfTrioWorker")
try:
blob = self.wayback_client.fetch_replay_body(
url=record['url'],
datetime=record['datetime'],
)
except WaybackError as we:
return dict(
status="error-wayback",
error_msg=str(we),
source=record,
key=default_key,
)
elif record.get('item') and record.get('path'):
# it's petabox link; fetch via HTTP
resp = requests.get("https://archive.org/serve/{}/{}".format(
record['item'], record['path']))
try:
resp.raise_for_status()
except Exception as e:
return dict(
status="error-petabox",
error_msg=str(e),
source=record,
key=default_key,
)
blob = resp.content
else:
raise ValueError("not a CDX (wayback) or petabox (archive.org) dict; not sure how to proceed")
if not blob:
return dict(
status="error",
error_msg="empty blob",
source=record,
key=default_key,
)
result = self.pdftrio_client.classify_pdf(blob)
result['file_meta'] = gen_file_metadata(blob)
result['source'] = record
result['key'] = result['file_meta']['sha1hex']
return result
class PdfTrioBlobWorker(SandcrawlerWorker):
"""
This is sort of like PdfTrioWorker, except it receives blobs directly,
instead of fetching blobs from some remote store.
"""
def __init__(self, pdftrio_client, sink=None, **kwargs):
super().__init__()
self.pdftrio_client = pdftrio_client
self.sink = sink
def process(self, blob):
if not blob:
return None
result = self.pdftrio_client.classify_pdf(blob)
result['file_meta'] = gen_file_metadata(blob)
result['key'] = result['file_meta']['sha1hex']
return result
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